Problem with stains on negatives

[Jbuck]

Im having this problem (see on the picture) now since a while and cant get rid of it.
it don't always happen.

i use a CPA2 with LIFT and the Jobo drums with Reels 2500

I used to use Rodinal 1+25
but now i use XTOL 1:1

Im loading the film with the emulsion side in.
I use prewash
i use only destiled water.

what could the cause of this stains be


thanks alot for your help guys!